(transitive, US) To keep someone or something under surveillance.

A mounted video camera used for the purpose of surveillance, as part of closed-circuit television.

Surveillance by electronic means.

Surveillance of a public or private space carried out by means of a video camera system.

An economic system based on the commodification of individuals' personal data for profit.

The pervasive surveillance of an entire population, or a substantial fraction thereof.

plural of surveillance camera

(law) A follow-up sub rosa investigation after an unsuccessful or unfruitful covert investigation.